The Collaborative International Dictionary of English v.0.48:

Flock \Flock\, v. i. [imp. & p. p. Flocked; p. pr. & vb. n.
   Flocking.]
   To gather in companies or crowds.
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         Friends daily flock.                     --Dryden.
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   Flocking fowl (Zool.), the greater scaup duck.
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The Collaborative International Dictionary of English v.0.48:

Flock \Flock\, v. t.
   To flock to; to crowd. [Obs.]
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         Good fellows, trooping, flocked me so.   --Taylor
                                                  (1609).
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The Collaborative International Dictionary of English v.0.48:

Flock \Flock\, n. [OE. flokke; cf. D. vlok, G. flocke, OHG.
   floccho, Icel. fl[=o]ki, perh. akin to E. flicker, flacker,
   or cf. L. floccus, F. floc.]
   1. A lock of wool or hair.
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            I prythee, Tom, beat Cut's saddle, put a few flocks
            in the point [pommel].                --Shak.
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   2. Woolen or cotton refuse (sing. or pl.), old rags, etc.,
      reduced to a degree of fineness by machinery, and used for
      stuffing unpholstered furniture.
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   3. Very fine, sifted, woolen refuse, especially that from
      shearing the nap of cloths, used as a coating for wall
      paper to give it a velvety or clothlike appearance; also,
      the dust of vegetable fiber used for a similar purpose.
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   Flock bed, a bed filled with flocks or locks of coarse
      wool, or pieces of cloth cut up fine. "Once a flock bed,
      but repaired with straw." --Pope.

   Flock paper, paper coated with flock fixed with glue or
      size.
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The Collaborative International Dictionary of English v.0.48:

Flock \Flock\, n. [AS. flocc flock, company; akin to Icel.
   flokkr crowd, Sw. flock, Dan. flok; prob. orig. used of
   flows, and akin to E. fly. See Fly.]
   1. A company or collection of living creatures; -- especially
      applied to sheep and birds, rarely to persons or (except
      in the plural) to cattle and other large animals; as, a
      flock of ravenous fowl. --Milton.
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            The heathen . . . came to Nicanor by flocks. --2
                                                  Macc. xiv. 14.
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   2. A Christian church or congregation; considered in their
      relation to the pastor, or minister in charge.
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            As half amazed, half frighted all his flock.
                                                  --Tennyson.
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The Collaborative International Dictionary of English v.0.48:

Flock \Flock\, v. t.
   To coat with flock, as wall paper; to roughen the surface of
   (as glass) so as to give an appearance of being covered with
   fine flock.
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WordNet (r) 3.0 (2006):

flock
    n 1: a church congregation guided by a pastor
    2: a group of birds
    3: (often followed by `of') a large number or amount or extent;
       "a batch of letters"; "a deal of trouble"; "a lot of money";
       "he made a mint on the stock market"; "see the rest of the
       winners in our huge passel of photos"; "it must have cost
       plenty"; "a slew of journalists"; "a wad of money" [syn:
       batch, deal, flock, good deal, great deal,
       hatful, heap, lot, mass, mess, mickle, mint,
       mountain, muckle, passel, peck, pile, plenty,
       pot, quite a little, raft, sight, slew, spate,
       stack, tidy sum, wad]
    4: an orderly crowd; "a troop of children" [syn: troop,
       flock]
    5: a group of sheep or goats [syn: flock, fold]
    v 1: move as a crowd or in a group; "Tourists flocked to the
         shrine where the statue was said to have shed tears"
    2: come together as in a cluster or flock; "The poets
       constellate in this town every summer" [syn: cluster,
       constellate, flock, clump]

Moby Thesaurus II by Grady Ward, 1.0:

130 Moby Thesaurus words for "flock":
   a mass of, a world of, army, assemble, assembly, band,
   band together, bang, bangs, bevy, body, brethren, bunch, charm,
   chip, churchgoers, class, cloud, cluster, clutter, cohue, collect,
   collection, colony, come together, company, congregate,
   congregation, convoy, covey, crowd, crush, dandruff, deluge, drift,
   drive, drove, fetlock, flake, fleck, fleet, flight, floccule,
   flocculus, flocks, flood, fold, forelock, fringe, gaggle, galaxy,
   gam, gang, gather, gathering, go, go together, group, hail, heap,
   herd, herd together, hive, horde, host, jam, kennel, laity,
   large amount, laymen, legion, litter, lots, many, mass, masses of,
   meet, minyan, mob, muchness, multitude, murmuration, nest,
   nonclerics, nonordained persons, number, numbers, pack, panoply,
   paring, parish, parishioners, people, plague, plurality, pod, pour,
   press, pride, quantities, quantity, quiff, quite a few, rabble,
   rout, ruck, scale, school, scores, scurf, seculars, set, shaving,
   sheep, shoal, skein, skulk, sloth, society, spate, spring, swarm,
   throng, tidy sum, trip, troop, troupe, tuft, watch, worlds of